Motor pump unit



22, 1946. R. T. CORNELIU S 2,393,237

MOTOR PUMP UNIT Filed May 7, 1942 4 Sheets-Sheet 1 Fig.1

Rmhara T. Cornelius Jan. 22, 19.46.

R. CORNELIUS MOTOR PUMP UNIT Filed May '7, 1942 4 Sheets-Sheet 2 Jan- '22, 1946- R. T. CORNELIUS MOTOR PUMP UNIT Filed May 7, 1942 4 Sheets-Sheet 5 P7 6 6 9 .1 w 1 E 8 5 W 5 ,7 u z i 4 2i i 1 1 O O Z n ii m m; F, 1 MM 7 WW I M 9 7 7 i L 1 Zn 9 9 i i b 0 5 u m "on 6 9 5 w o m 0. 1i 1 6 m l hmwmu 7 w m 9 A 00 M 14 i w 9 m 8 I? O 9 ww /m m w M I Insulation Insulation 9b Jan 22, 1946.

R. T. CORNELIUS MOTOR PUMP UNIT Filed May '7, 1942 I 4 Sheets-Sheet 4 Insulation k l gvwmwkw Richard T. Cornelius Patented Jen. 22, 1946 uurrso sures PATENT OFFICE I Ammonium 1, 1942, Serial No. 442,008

l 12 Claims.

My invention relates to pumps and particularly to pumps having 9. variable capacity.

An object of the invention resides in providing an insulating nump and's omitnol devieetheretor by meansol which the volume discharged from the pumpmay be quickly and accurately varied without direct adjustment of the pump.

Another obiect'o! the invention resides in providinaa control device adapted to control the number of strokes or pulsations of the pumpper unit of time, whereby the capacity of the pump is correspondingly regulated.

My invention utililies'an electrically operated pump; and includes a periodically: o m'able control device; tolether with meemzi'or vminlr. the period or operation. of: said; cmitrol A tenure ofthe-invention resides in: comtructing thecontrol device with an oscillator! member and. in. providinsa periodoisoscillafimoissaidsmember.

Another object: of the invention resides in utilizing; a weinhted mu Divotedi to the oscillatom member and movable in a direction to vet! noriodoi oscillation and instillther: pmvidintmeans tor holdin the arm inadlusted position.

Another object o: theinvention-resides in providins a switch operated: by: theovcillatory memher and in empmvins a. circuit controlled by said switchlor oontrollins theoperation of thenump.

Fi 2 is a lonaitudinal elevations-l sectional view takentbroush the pump- Fis. 3 is an elevational cross-sectional view substantially no line-34 01:558- 2;,

Fig. 4 is a cross-sectional detail view taken: on libel-Lot FM. 2.

construction for varying the A Fig. 5' i a longitudinal elevational sectional view of the control devioeot the invention.

Fig. 6 is an elevational cross-sectional view takenon line-H oi Fig 5.

Fig. '7 is an elevational cross-sectional view taken Onune m; 5."

Fig. 8-is aview similar to Fig. 5-showing the parts in altered-position.

Fig. 9- is a-view similar to Fig. 6 showing the parts in positions corresoomiingv to those shown in Fig. 8..

For the purpose of de-icing. aeroplane propellers; it becomes desirable to pump ade-icins liquid such as alcohol along the surfaces of the propeller blades andtowary the amount 0! liquid furnished thereto. customary practice has been to utilize a. number of: variable capacity pumpsand to individually change the capacity of each pump to meet the desired requirements. This requires separate adjustment of the pumps andinconvenience and loss of time to the operators. The instant invention provides aconstruction by means of which anumber of pumps may be controlled by a single control device and the output of the pumps simultaneously varied by the adjustment of the single control device.

For the purpose of illustrating the application 0! my invention, I have diagrammatically shown in Fig. 1 an aeroplane whichisindicated by the mferoncenumeral 'll.. 'Ihisaeroplane includes a fuselage I2 and wings 13 connected therewith. The cowl oi, the fuselage is designated by the reference numeral 14. On the wings 13 are mounted two motors 15- and 16 having propellers 11- and I8 driven thereby, The propellers TI and Whave a number of blades 18 mounted on a central hubll. Inasmuch as the construction of the aeroplane forms no particular feature of the invention, the same has merely been shown in 40 diagrammatic form and has not been illustrated in detail, though it can readily be comprehended that the. invention is applicable to variou types 01 aeroplanes, as will become evident from the following description.

The invention utilizes a control device 82 which is mounted on the instrument panel 83, accessible from the cowl H and two pumps 85 and I6. Inasmuch as both of these pumps are identical, only the pump 85 will be described indetail.

The pump 85 is best shownin Figs. 2 to 4; in-

- body and is threaded into the plate clusive, and consists oi a pump unit I which comprises a cylinder ll having a bore I 2. This bore receives a reciprocable piston l3. The bore l2 extends through both ends of the cylinder H and is closed at its outermost end by means of aflap valve M which is seated against a seat l5 formed at the extreme end of the cylinder II. The piston i3 has a passageway l6 within the same which is closed at its inner end by means of a valve head I! seated against a seat l8 at the end of the piston. The valve head I! has a stem l9 which extends along the passageway I8 and has secured to its outer end a cross head 2|. A compression coil spring 22 seated against the cross head 2 t and against a shoulder 23 is formed in the piston l3 and urges the valve head I! into closing position. The cross head 2| is provided with a number of passageways 24 through which communication with the passageway It on each side of the cross head 2| may be had, so that fluid may travel directly through the passageway l8, past the valve head l1 and into the cylinder chamber 25.

The pump 85 is electrically operated by means of an electromagnett 4D. The cylinder H is received within a tubular core 26 of ferrous material forming part of the electromagnet 40 which core is provided with an outwardly extending flange 21. A tube 28 of non-ferrous material encircles the core 26 and forms a support for an electromagnet coil 29 which encircles the core 26 and extends considerably beyond the end of the core 26. The magnetic circuit of the electromagnet 40 further includes a sleeve 3| of ferrous material which encircles the coil 29 and is in intimate contact with the flange 2! of core 26. This sleeve is connected to and end plate 34 which has an opening in the central portion of the same indicated at 35 and receiving the end of the tube 28. A tubular armature 36 of ferrous material is slidable within the tube 28 and is adapted to approach the end of the core 26 when the piston reaches the end of its stroke. This armature is attached to the protruding end of the piston l3 and serves to actuate the same. These two parts are held in proper position by means of an inwardly extending flange 31 formed on the inner surface of the armature 36 and corresponding outwardly extending flange 38 formed on the outer circumference of the piston 13, flange 38 being frictionally held in place in the armature 36. The flanges 31 and 38 of the armature 35 and piston l3 are provided with axially extending openings 39 which permit of the passage of fluid past said armature. The armature 36 and the piston [3 are urged into position away from the end of the cylinder H having the valve H by means of a compression coil spring 4|. This coil spring is seated at one'end against the flange 38 of piston l3 and at its other end against a shoulder 42 formed on the exterior of the cylinder II. It will readily become apparent that upon energization of the coil 29, the armature 35 is urged toward the core 26 and movement of the piston l3 occurs in a direction toward the end of the cylinder H.

The pump unit It) is mounted in a case 43 which has a cylinder body 44 bored at 45 to receive the sleeve 3|, the flange 21 and the plate 34. The unit [0 is held in position within the body 44 by means of a screw 33 which extends through said 34. The body 44 has two legs 46 issuing downwardly from it which are threaded at 41 to receive attaching screws, not shown, by means of which the case 43 may be attached to any suitable support. The case 43 has formed on it an electrical outlet box 48 which has attached to it an electrical connector 49 which is connected in the electrical system of the invention, as will be presently described. Conductors 5i and 52 within the chamber 53 formed in the outlet box 48 are connected to the coil 29 and serve to energize the same, as will appear.

Screwed into the end 54 of the plate 34 is a plug 55 which is internally threaded at 56 to receive a tube connector. This plug has a passageway 51 therein which communicates with the passageway l6 in the piston l3. A neck 58 formed on the inner portion of the plug 55 engages the end of the piston I3 and forms a stop for limiting the movement of said piston away from the valve l4.

Screwed in the end of the core 26 opposite the plug 55 is another plug 59. This plug is threaded at to receive a suitable tube connector and has a passageway 6| extending through the same. The inner end of the plug 59 is formed with legs 62 which provide passageways 63 for bringing the passageway 6| into communication with the valve chamber 64 formed in the core 26 at the end of the cylinder I I. The disk valve I4 is disposed within this chamber and is limited in its movement away from the valve seat I5 by means of the legs 62. The valve disk I4 is formed with recesses at its outer edge (Fig. 4) which bring the valve chamber 64 into communication with the chamber 25 within the cylinder II when the valve I4 is open. A compression coil spring 66 within the chamber 64 is seated at one end against the valve disk l4 and at its other end against a shoulder 61 formed on the plug 59 and holds the valve disc M in closing position.

The operation of the pump 85 is as follows: When the coil 28 is energized, a magnetic circuit is established through the core 28, the sleeve 31, the end plate 34 and the armature 38. This causes the armature to move in a direction to close the air gap 88 formed between the end of the said armature and the end of the core 26. Such movement of the armature urges the [piston l3 to move along the bore l2 of cylinder II and to compress the liquid within the chamber 25. When the pressure in chamber 25 becomes sufficient, valve l4 opens and the compressed liquid passes through the various passageways 85, 83 and SI and into the tube connected to the plug 59. Upon deenergization or the coil 29, spring 4| urges the armature 38 to move in the opposite direction. Suction within the chamber 25 causes the valve head I! to open and a fresh charge of liquid to be drawn into the chamber 25. In this manner, liquid is pumped by the pump 85 upon alternate energization and deenergization of the coil 29.

The control device 82 is best shown in Figs. 5 to 9, inclusive. This device includes a case 81 which is formed with a back 88 and a cup-shaped wall 89 extending outwardly therefrom. The cupshaped wall has an opening 9| in it through which extends a threaded member 92 having a flange 88 extending inwardly therefrom and engaging the said back 88 upon the interior surface thereof. A lock nut 94, screwed upon the member 92 and engaging the back 83, holds the member attached to the case 81. A similar lock nut 95 engaging the instrument panel 83 holds the case 88 rigidly attached to the said instrument panel.

The control device includes an electromagnet aaoaas'r 99 mm; a. core 96 which consists or two legs 6'! I connected by a-yoke $9; The yoke 99 mean opening IIII through it through which a sleeve I92 formed on the flange 93 of member "extends;- This sleeve has a shoulder I63 thereon which cngagesthe yoke 99 adjacent the opening IIH andclamps the core 96 in position with lntho case 61; The core 96 further inciudes two screws I04 and I05 which extend through the yolrcll and which are threaded into pole pieces I96 and I61. Mounted on the said screws are I96 which hold the parts in assembled relation and which support electromagnet coils I09. Secured to the outermost ends of the legs 31 and 96 is a bar H2 of ferrous material which .said'legs. This bar also forms a support for a cover" 4101'. case 81 which is constructed from insulating" material and which is attached to said bar bymeans' of screws, II5 extending through said cover and threaded into the bar.

Mounted for oscillation within the space within the" pole pieces I06 and I01 and the core 96 is' an armature indicated in its entirety by the reference numeral I I6. This armature has poles IIT and H6 which are spaced from the pole pieces I06 and I01 by means of an air gap H9. The armature II6 has a stub shaft I26'on one end which has secured to it a ball bearing I2I and at its'other end a ball bearing I22 which are supported in a manner to be presently described. The; armature II6 has a bore I24 therein which opens outwardly through the end thereof opposite the ball bearing I2 I and has a radially extending slot I25 formed in the same end thereof which intersects the bore I24. A ball bearin I22 is mountedin and attached to the bar H2. Journaled in the ball bearing I22 is a short shaft I23 which is provided at its end opposite the ball bearing I22 with an enlarged portion I26 which is slidablymounted in the bore I24. This enlarged portion has a radial slot I21 in it and a bore I28 which extends throughout the major portion of the length. thereof and which opens exteriorly through the end of the enlarged portion I26. In this bore is slidably mounted a plunger I29 which is seated at one end in a socket I3I in. the armature H6. The other end of this plunger is engaged by a compression coil spring I62 which is seated at its other end against a shoulder I63 formed at the end of the bore I28. By means of this construction, the armature H6 is. urged to move away from the bearing I22 through the action of the spring I62.

' Disposed in portions of the slot I25 near the periphery of the enlarged portion II1 of armature II6 are two arms I34 and I35 whichare pivotedto said armature by means of pins I36 which extend jointly through the enlarged portion of the armature and said arms. These arms are provided at their outermost ends with weights I31 which tend to draw the arms radially outwardly as shown in Fig. 8, when the armature H6 is oscillated. The arms I34 and I35 have fingers I38 formed thereon which extend through the slot I21 in shaft I23 and which engage shoulders I60 in said shaft formed by the slot I21. These shoulders limit the outward movement of the arms I34 and I35 and determine the period ofoscillation of the armature I I 6.

Relative axial movement between the armature H6 andfthe shaft I23 is controlled by means of a mechanism. best shown in Figs. 5 and 8. The threaded member 92 which extends through the panel and. mpport's the case 32: oithe invention is formed with a bore I4I. Slidably mounted in thisbore is a sleeve I62 which is formed with internal threads" I43. This sleeve has a flange I at its'lnteriorend which'abuts against the flange on the threaded member 92 and is provided with a removable collar IM- adjacent the endof the threoded member 92 whichhclds the said" sleeve fromaxial movement withinthe bore I The outer end of the sleeve I 42 has secured to it by mcans o! a set screw Ivian' operating. knob I by means of which the sleeve I42 may be rotated. Rotation of the said sleeve is limited to a portion of a revolution by means of a pin I41" attached to the flange 93 on the threaded member "which operates in a groove MI! in the periphery of the flange I48 of sleeve I42. Screwedlnto the threads I of the sleeve I42is a spindle I49 which is formed at its inner end' with a cup-shaped member I 5I receiving the outer race of the ball bearing III. This cupshaped member isslldably supported and held from rotation by meansof chamber of splines I52 at. the outer periphery of said cupshaped member which operate in simiiarly formed keyways I53 formedin the sleeve I02. The threads I43 are relatively coarse, being quadruple-threads, so that a small movement of the knob I46-will procure appreciable movement of the spindles M9. By. means of this construction, the-armature H6 is moved in a longitudinal direction, so as to limit the outward movement of the weighted arms I 34-and= I35 and at the same time; the said armature issupportedfor oscillation in th bearing I2I' carried bythe spindle I49.

Formed on the shaft I23 adjacent the bearing I22 is a hub I54. Thehub I5 has secured to it a spiral leaf spring I55-which encircles the same. The outer end I56 of this leaf spring is secured to a post I5Twhich is attached to sprin clip I53. The clip I58 is slidabiy mounted on a segment I59 which is concentric with the shaft I23and which is attached to-the bar I I2 by means of two screws I-6I. By means of this construction, the spring I56may be adjusted so that the armature I'IIi occupies the position relative to the pole pieces lfli and I91 shown in Fig. 9 when the parts are in normal position. When the coils I09 of the electromagnet are energized, the arma I ture I I6 is shifted to the position shown in Fig. 7

and the spring I55 tensioned. Upon deenergization of the said coils, spring I55retums the armature to its normal position shown in Fig. 9.

Operating in conjunction with the armature H6 is a switch indicated in it entirety by the reference numeral I64. This switch comprises two contacts I and I66 which are carriedon spring arms I61 and I68, respectively. The said spring arms are attached to brackets I65 and Ill which are secured to the inner surface of cover III of the case 82 by means of rivets I12. Spring arm I61 is urged into engagement with a stop I13 fixed relative to the bracket I69, while the spring arm I56 is similarly urged into engagement with a stop I14 secured to the bracket Hit Th resiliency of the-arms I61 and I 68 tends to open the switch I64, the parts in open position being shown in Fig; 6. The spring arm I68 has attached to the end thereof a finger I15 by means of which the said spring arm may be urged toward the springer-m I61 to bring the contacts I65 and I66 into contact with one another; Secured to the hubv I54 of shaft I23-is an arm I16 which is adaptedto engage the finger I15 and to. move the spring arm I66 in a manner to cause the contacts I65 and I66 to make contact and to close switch I64.

The operation of the control device 82 is as follows: The coils I69 are connected in series with the switch I64 and a source of electric current. When the electromagnet 96 is deenergized, switch I64 is closed, as shown in Fig. 9. When the circuit through coils I69 is completed, the electromagnet 96 is energized, which causes the armature I I6 to be moved from the position shown in Fig. 9 in which the switch I64 is closed and to the position shown in Fig. 6 in which the arm I 16 has receded from the finger I15 and permitted the contacts I65 and I66 to separate. A soon as these contacts separate, the circuit through the coils I09 of the electromagnet 96 are deenergized, and the spring I55 moves the armature back to its normal position. By means of this construction, an oscillatory movement of the armature I I6 results, the period of said movement being dependent upon the position to which the weight arms I34 and I35 are permitted to move. It will be readily comprehended that when the knob I46 i turned, that the outermost position of the said arms is varied and the period of oscillation of the armature H6 is correspondingly varied. By means of this construction, I am able to procure a variation in the timing period of approximately 1 to 5.

When my invention is used for the deicing of the propeller blades of an aeroplane, the parts are connected as diagrammatically illustrated in Fig. l. Coils I69 of the control device 82 are cnnected together and one of the other ends of one of said coils is connected by means of a conductor I11 with the contact I66 of switch I64. The other contact I65 of said'switch is connected by means of a conductor I18 with a manually operated switch I19 which, in turn, is connected by means of a conductor I 8| with the battery I82 of the aeroplane. The other side of the battery I82 is connected by means of a conductor I84 with the pump 86 which is further connected by means of a conductor I85 with the contact I66 of switch I64. The pump 85 is connected in parallel with the pump 86 by means of two conductors I86 and I81 which, in turn, are connected to the conductors I84 and I85, respectively. The switch I64 is shunted by a resistance I88 and a condenser I89 which are connected in parallel in a circuit I9I which is connected to the conductors I18 and I 85 previously referred to.

Alcohol for use for deicing purposes is contained in a container I92 which has connected to it a pipe line I93. This pipe line has disposed in it a valve I94 which, in turn, is connected to two branch pipes I95. Both of these branch pipes are connected to filters I91 which, in turn, have connected to them pipes I98 and I99. These pipes, in turn, are connected to the threads 56 in the plugs 55 of the pumps 85 and 86 which direct the alcohol into the inlet passageways 51 of said pumps, The outlet passageway 6| of said pumps are connected to other conduits 26I which, in turn, are connected to check valves 262. These check valves are connected to the distributor pipe 263 which lead the alcohol to devices used for distributing the same upon the blades 0f the propellers 11 and 18 and which devices are indicated generally by the reference character 264. Inasmuch as such devices are well known in the art, the same have not been illustrated in detail in this application.

When my invention is used as a deicing system for the propeller blades of an aeroplane, the

same functions as follows: Upon closing the switch I19, the control device 82 is energized and the switch I64 is periodically opened and closed. The period of said control device depends upon the setting of the knob I46. Inasmuch as both of the pumps 85 and 86 are connected in parallel, in a circuit which includes the switch I64, the electromagnets 46 of both of said pumps are simultaneously energized along with the energization of the electromagnet 96 of the control device. Thus, the pumps each make one stroke for each cycle of the control device and a certain amount of alcohol is pumped by each pump to the respective distributing device 264 to which it is connected. It will readily be comprehended that the period of oscillation of the control device 82 is effective to control the number oi. strokes of the pumps 85 and 86 and thus to control the output of the said pumps. In this manner, the volume of alcohol discharged upon the propeller blades may be accurately and easily controlled at will.

My invention is highly advantageous in that a pumping system is employed in which the capacity oi the pump may be varied from extremely low to extremely high limits. With my invention, accurate metering of the liquid pumped can be procured, so that waste of alcohol is overcome and, in addition, the correct amount delivered at all times. With my system, any number of pumps may be controlled by a single control device which may be remotely situated from the pumps and within easy reach of the operator at the instrument board of the aeroplane. The device is extremely compact and may be constructed relatively light, so as to occupy a minimum amount of space on the aeroplane and so as to not unnecessarily increase the weight to be carried by the plane.

Changes in the specific form of my invention, as herein described, may be made within the scope of what is claimed without departing from the spirit of my invention.

Having described my invention, what I claim as new and desire to protect by Letters Patent is:

i, In a timer, a pivoted oscillatory member, a switch, means on said oscillatory member for op erating said switch, a spiral spring attached at one end to a part movable with said oscillatory member, a segment, a slide movable along said segment, said spring being attached at its other end to said slide, means for periodically moving said oscillatory member in one direction to tension said spring, said means being controlled by said switch.

2. In a timer, a pivoted oscillatory member, a switch, means on said oscillatory member for operating said switch, a spiral spring attached at one end to a part movable with said oscillatory member, a segment, a slide movable along said segment, means for periodically moving said oscillatory member in one direction to tension said spring, said means being controlled by said switch, a, weighted arm pivoted to said pivoted member and movable radially relative thereto and means for limiting the outward movement of said weighted arm.

3. In a timer, a pivoted oscillatory member, a weight carried by said member, means for guiding said weight for movement toward and from the axes of said member, a timing control member, means for guiding one of said two first named members for movement relative to the other, means acting between said timing control member and said weight for limiting the outward movement of the weight, a slidable member, said ablemember. means for restraining rotation of said slidable member and notationalmeans'em. gazing saldslidable member adowing :axial movement'thereof. I

4. In a timer,-a pivoted oscillatory a weightcarried bysaid member, means foizgnicling :said; weight for movement toward and from the meet said a-timin control ber, means ;for of said two first named members for movement relative to the other, means acting between said timing control member and said weight for limiting the outward movement of the weight, a slidable member, said pivoted member oscillating relative to said slidable member, means for restraining rotation of said slidable member and threaded means engaging a part movable with said slidable member and upon rotation causing axial movement thereof.

5. In a timer, a support, an oscillatory member, a weight carried by said oscillatory member, means for guiding said weight for movement toward and from the axis of said oscillatory member, a bearing carried by said support, a timing control member mounted in said bearing and oscillating with said oscillatory member, said oscillatory member being axially slidable relative to said timing control member, means acting between said timing control member and said weight for procuring movement or the weight relative to the axis of the oscillatory member upon axial movement of the oscillatory member, and means for imparting to said oscillatory member axial movement.

6. In a timer, a support, an oscillatory member, a weight carried by said oscillatory member, means for guiding said weight for movement toward and from the axis of said oscillatory member, a bearing carried by said support, a timing control member mounted in said bearing and oscillating with said oscillatory member,

said oscillatory member being axially slidable.

relative to said timing control member, means acting between said timing control member and said weight for procuring movement of the weight relative to the axis of the oscillatory member upon axial movement of the oscillatory member, means for imparting to said oscillatory member axial movement, means for imparting to said oscillatory member oscillatory movement in one direction and resilient means acting between said adjusting member and a part fixed relative to the support for imparting to said oscillatory member oscillatory movement in the other direction.

7. In a timer, a support, an oscillatory member, a weight carried by said oscillatory member, means for guiding said weight for movement toward and from the axis of said oscillatory member, a bearing carried by said support, a timing control member mounted in said bearing and oscillating with said oscillatory member, said oscillatory member being axially slidable relative to said timing control member, means acting between said timing control member and said weight for procuring movement of the weight relative to the axis of the oscillatory member upon axial movement of the oscillatory member, a slidable member in axial alignment with said bearing, means carried by said support for guiding said slidable member for axial movement and means for supporting said oscillatory member for oscillatory movement with respect to said slidable member and for causing simultaneous sliding movement of Saidslidoble member; saidosoillatorymember; i g I 8. In a timer, a support, anoscillatory member, asweight carried by saidoscillatory meansior guiding said weightimr ward and iromthe axisv of ysaid oscillatory member, a bearingwriedbysaid support, aatiming control member .=,mounted in said bearing oscillating with usicillatorlr inc-ember, ,said

oscillator member being axiailyslidable relative to said timing control member, means acting between said timing control member and said weight for procuring movement of the weight relative to the axis of the oscillatory member upon axial movement of the oscillatory member, a slidable member in axial alignment with said bearing, means carried by said support for guiding said slidable member for axial movement, means for supporting said oscillatory member for rotational movement with respect to said slidable member and for causing simultaneous sliding movement of said slidable member and said oscillatory member, and a threaded member for engagement with said slidable member to impart to said slidable member and oscillator member axial movement.

9. In a timer, a pivoted oscillatory member having a bore, an arm, a weight carried by said arm, means for pivoting said arm to said pivoted member to cause said weight to move transversely of the axis of said pivoted member upon swinging of said arm, a finger on said arm movable substantially axially upon swinging of said arm and a timing control member disposed within said bore and having a part engaging said finger, said members being guided for relative axial movement, and means for moving one of said members axially relative to the other to limit the outward movement of said weight.

10. In a timer, a pivoted oscillatory member having a bore and a transverse slot communicating with said bore, an arm, a weight carried by said arm, means for pivoting said arm to said pivoted member to cause said weight to move transversely of the axis of said pivoted member upon swinging of said arm, a finger on said arm extending through said slot and into said bore and movable substantially axiall upon swinging of said arm and a timing control member disposed within said bore and having a shoulder engaging said finger, said members being guided for relative axial movement, and means for moving one of said members axially relative to the other to limit the outward movement of said weight.

11. In a timer, a pivoted member, a spring connected to said pivoted member, motive means for imparting to said pivoted member intermittent torque impulses, said motive means and spring causing said pivoted member to oscillate about its axis, a weight oscillating with said pivoted member and timing the period of oscillation of said member, means for guiding said weight for movement toward and from the axis of said pivoted member and axially movable means for limiting the outward movement of the weight.

12. In a timer, a support, an oscillatory member, a weight carried by said oscillatory member, means for guiding said weight for movement toward and from the axis of said oscillatory member, a bearing carried by said support, a timing control member mounted in said bearing and oscillating with said oscillatory member, said oscillatory member being axially slidable relative to said timing control means, means acting between said timing control member and said weight for procuring movement of the weight relative to the axis of the oscillator member upon axial movement of the oscillatory member, means for imparting to said oscillatory member axial movement, an electromagnet formed with spaced pole pieces having facing surfaces parallel with the axis of said pivoted member, an

armature movable with said pivoted member and 10 

